The carbon-carbon bonds in benzene are . of equal length and are shorter than the double bond of equal length and are midway between a single bond and a double bond of equal length and are longer than the single of unequal length and alternate as single and double bond none of the above

of equal length and are midway between a single bond and a double bond

Explanation:

Benzene -

The chemical formula for benzene is C₆H₆ , which consists six bonds , which are of each bond length , which is somewhere in between double and single bond .

The property responsible for this type of bond length in benzene molecule is Resonance .

Resonance refers to the process of delocalization of electron in the given structure .

Hence , from the given question ,

Due to the process of resonance , the bond length between the carbon and hydrogen is of equal length .

explanation:

let the different atoms be x and y. each with four protons and same mass will be represented as follows.

mass number is number of protons + number of neutrons.

            and  

since, it is given that one has a negative charge while the other is neutral. therefore, there will be increase in number of protons and the atom will be represented as follows.

according to periodic table, mass number of beryllium is 9 and it has atomic number 4 so, the atoms will be and .  

the protons and neutrons will be located inside the nucleus whereas the electrons will be revolving around the nucleus.